Testing of Woven Wire Cloth according to ISO 9044


 

Determination of the wire diameter

The wire diameter after weaving may be determined by using one of the following procedures:

1.) by measuring wires which have been loosened from the woven wire cloth (e.g. by using a micrometer screw);

2.) by measuring the wires in the cloth, if there is sufficient space for the measuring instrument.

The tolerance of the wire before weaving can no longer be determined in the woven wire cloth, because of its heavy deformation during weaving. The nominal wire diameter, however, can be calculated using the empirical weight formula.

Micrometer screw to determine the wire diameter

 

Aperture width (Measuring row method)

In this simplified method, the number of pitches (p) in a given length (L) is determined. The given length is then divided by the number of pitches to give the average pitch. Subtraction of the wire diameter (d) from the average pitch then gives the aperture width (w)).

Calliper (vernier) for measuring aperture widths of more than 4 mm; it may be used for aperture widths of more than 10 mm, too.

To determine the arithmetical mean value of the aperture widths, as many pitches have to be measured as are necessary to obtain a representative value.

Counting glass for measuring aperture widths less than 1 mm in a measuring row with determined length.

When measuring aperture widths between 16 mm and 1 mm 10 pitches have to be checked; smaller aperture widths - up to 0.1 mm - should be checked within 20 pitches.

Measuring row with determined length for aperture widths of 1 up to 16 mm.
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